CVE-2026-24688

EUVD-2026-4753 · Published Jan 27, 2026

pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects cannot upgrade yet, consider applying the changes from PR #3610 manually.

Technologies

Pypdf_Project PypdfPypdf Pypdf

Weaknesses

CWE-835

CVSS scores

v4.05.1CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
v3.14.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

MITRE ATT&CK

Inferred

Where this vulnerability fits in an attack

ReconImpact

Initial Access

T1190Exploit Public-Facing Application

References

https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1
https://github.com/py-pdf/pypdf/pull/3610
https://github.com/py-pdf/pypdf/releases/tag/6.6.2
https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73
https://nvd.nist.gov/vuln/detail/CVE-2026-24688
https://github.com/py-pdf/pypdf

Potentially impacted assets

See if this affects your attack surface